The persistence of sound in a hall is called ___________________

The term "prolonged sound" refers to something that refers to having an ongoing influence. Multiple reflections may be to blame for these results.

We must first understand the definitions of the phrases used in the choice before we can respond to the question. We should first go through the definitions of these words because if we don't know the precise meanings of all the possibilities given in the question, we run the risk of selecting the incorrect response.
Definitions:
A. Reverberation, or the continuation of sound even after it has stopped, is a phenomena. Reflections from surfaces inside a closed surface are to blame for this. Reverberation may be defined as the overlapping of sounds, in other words.

B. Resonance is the phenomenon through which an external force causes a system nearby to oscillate with a larger amplitude than the system's initial amplitude at a certain frequency of oscillation.
Important: When a regularly applied force's frequency is equal to or nearly equivalent to the inherent frequency of the system on which it affects, resonance occurs.

C. Acoustics - The study of mechanical waves in all states of matter is the focus of this discipline of physics. We must understand what mechanical wave implies in this situation. Therefore, a mechanical wave is one that moves energy via a medium.

D. Articulation - Articulation is the creation of distinct, clear sounds, such as in a voice.

Reverberation should be the correct response to the given question because it refers to the prolongation of sound even after the source of the sound has stopped producing additional sounds, as can be seen after reading the definitions of the given options. Although all of the words are related to sound, each word has a specific meaning. Reverberation is the appropriate response because the question was not about amplitude but rather the persistence of sound in a room during which the amplitude keeps decreasing. We could have thought of resonance, but we must keep in mind a very important fact that resonance of a system is always related to the highest amplitude.

Hence, the correct answer is option A.